Barley mob disease

Symptoms mainly damage the leaves and leaf sheaths. At the beginning of the disease, it is a white, transparent, small spot, which expands from dark gray to light brown, with a darker edge and a long oval. When there are more lesions, they are combined with moire, and the leaves are dead with yellow leaves, forming sub-subcutes under the epidermis of the diseased part. Under high humidity conditions, gray moldy layers (conidial stems and conidia) are formed on the lesions.

The pathogen Rhynchosporium secalis (Oudem.) Davis called Fusarium solani, a fungus belonging to the genus Deuteromycotina. Can produce Fusarium glycoside toxin. Conidiophores are colorless and short. Conidia wedge-shaped, with 1 transverse septum, colorless, size 12-202-4 (μm).

Transmission routes and pathogenic conditions The pathogens were contaminated with conidia and mycelia on wintering and over the summer. After germination, the conidium of barley was infected by wind and rain to infect the seedlings, and it could be repeatedly infected in the whole growth period. The spore germination temperature is 10-20°C, but it does not germinate above 25°C, and the temperature is 18°C ​​and relative humidity is 92%. The spores invade the host within 6 hours. 20 °C incubation period 11 days. Low temperature and high humidity are conducive to disease occurrence, and the density is too high and the disease is too long.

Control methods (1) Elimination of wintering (summer) bacteria sources, deep-turning after harvest, and promotion of decomposition of diseased bodies. (2) For close planting, do not apply too much nitrogen. Pay attention to drainage, cultivator, reduce the humidity in the field. (3) 50% carbendazim wettable powder for seed dressing is seeded at a seed weight of 0.3% after 10-20 days of seeding. (4) Early stage of onset of spraying 15% triadimefon WP 1000 times or 40% extermination Suspending agent 600 times, 70% thiophanate-methyl wettable powder 1000 times, 50% carbendazim WP 800 times Liquid, 60% anti-mildew Po WP 1000 times, 70% mancozeb wettable powder 400 times, 667m2 liquid 75-100L.

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